Flanking sequences for the human intercellular adhesion molecule-1 NF-kappaB response element are necessary for tumor necrosis factor alpha-induced gene expression.

The Journal of Biological Chemistry
L L PaxtonS W Caughman

Abstract

The regulated expression of intercellular adhesion molecule-1 (ICAM-1) by cytokines such as tumor necrosis factor alpha (TNF-alpha) plays an important role in inflammation and immune responses. Induction of ICAM-1 gene transcription by TNF-alpha has previously been shown to be dependent upon a region of the ICAM-1 5'-flanking sequences that contains a modified kappaB site. We demonstrate here that this modified kappaB site alone is insufficient for induction of transcription by TNF-alpha. Site-directed mutagenesis of both the kappaB site and specific flanking nucleotides demonstrates that both the specific 5'- and 3'-flanking sequences and the modified kappaB site are necessary for TNF-alpha induction. Further, site-directed mutagenesis of this modified kappaB site to a consensus kappaB site allows it to mediate transcriptional activation in response to TNF-alpha, even in the absence of specific flanking sequences. Transcription through this minimal ICAM-1 TNF-alpha-responsive region can be driven by co-expression of p65, and the minimal response element interacts with p65 and p50 in supershift mobility shift assays. However, when in vitro transcription/translation products for the Rel proteins are used in an electrophoretic mo...Continue Reading

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